<SCRIPT LANGUAGE="JavaScript">
function CountLeft(field, count, max) {
if (field.value.length > max)
field.value = field.value.substring(0, max);
else
count.value = max - field.value.length;
}
</script>

<center>
<form name=sample action="">
<font size="1" face="arial, helvetica, sans-serif"> 
<input name="text" type="text" size="40"
//Karakter Sayısını  Aşşağıda Alt Alta Yazan 160 Ları Duzenleyerek yazın By Faruq.
onKeyDown="CountLeft(this.form.text,this.form.left,160);" 
onKeyUp="CountLeft(this.form.text,this.form.left,160);">
<input readonly type="text" name="left" size=3 maxlength=3 value="50"> 
</font>
</form>
</center>